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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2536c27ebeb1b5858b8929d57e7b1a8f6c443ba7801567ce2bc2be096ea1ab' 
  AND token = '8uOJnwSHS+jumShkR8/z2qfxoRS1XTwpjjYOHDeSsuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}